Apparatus for the manufacture of red lead



(No Mbdei.)

- APPARATUS FOR THE MAN F RED LEAD.

nted Apr. 4,1882.

Fig.1.

VNITED *rA'rns ATENT .rrrcn.

NORRIS B. GREGG, OF ST. LOUIS, MISSOURI.

.SPECIFICATION forming part of Letters Patent No. 255,970, dated April 4, 1882.

Application filed December 20, 1880.

To all whom it may concern:

Be it known that I, Norms B. GREGG, of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Apparatus for the Manufacture of Red Lead, of which the following is a full, clear, and exact description, reference being bad to the accompanying drawings, forming part of this specification.

Figure l is a vertical section of my apparatus atww. Fig. 2 is a horizontal section at as m. Fig. 3 is a detail horizontal section at a." x, enlarged. Fig. 4 is a detail vertical section at ac x, enlarged.

A is a reverberatory furnace with two fireplaces, B, upon opposite sides of the rotary converting-pan U. D are bridgewalls ex tending above the level of the pan 0 and overhanging the edge of the same at (I, so as to prevent the ov'erheatin g of the pan.

It VIII be seen that the bridge-walls are extended around the pan, leaving a small space, (1', for the ascent of air between the pan and the wall to cool the pan.

E is a bridge-frame or spider, whose legs rest on tram-screws F, turning in bearing-nuts F, for the leveling or vertical adjustment of the spider.

The pan O is supported at the center upon a vertical shaft, G, having journal-bearing in the center of the spider and in a step-box, H. The shaft G carries a bevel cog-wheel, 1, engaged by a bevel-pinion, J, on the drive-shaft K, which carries a belt-pulley, L. On the arms 0 of the spider are standards giving bearing to the wheels M, which assist in sustaining the pan O.

N is a circular wheel-rail upon the bottom of the pan. The pan I have made'of iron, with a lining, O, of graphite or tire-clay.

O is a bar extending diametrically over the pan with its ends supported on the brick-work at D.

P are the stirrers or flights, which extend downward from the bar to near the bottom of the pan. I prefer to incline them in such manner that they shall turn the lead inward, and the flight of each half of the bar shall demolish the ridges formed by those at the other end, so as to keep the lead continually stirred (No model.)

and present all portions equally to the action of the heat deflected from the dome or arch Q. The centrifugal influence upon the material in the rotating pan 0 causes it to move toward the periphery ot'the pan, and the flights or stirrers are preferably so inclined to move it toward the center to prevent its accumula tion at the outer portion of the pan.

The upper side of the bar 0 is protected from the direct action of the deflected heat from the arch Q by semi-cylindrical tiles R, of graphite, fire-brick, or other material capable of withstanding the heat, and thus an air passage or chamber, 0, is formed between the top of the bar and the tiles. At the center of the chamber 0 is a flue, R, extending vertically upward through the arch Q, so as to discharge the heated air from the chamber. This chimney I prefer to make of the same refractory material as the tiles R.

S is an air-pipe placed axially in the flue R and open at both ends. Its purpose is to supply air to the lower part of the chamber 0, said air, after having become heated, escaping through the fine R, as aforesaid.

The center of the bar 0 is sustained by a rod, T, which is attached at the lower end to the bar and at the upper end to any fixed object. The rod is provided with a screw-swivel, t, by which its length may be adjusted, as required. The rod T extends through the tube S.

U are chimneys, one of which is shown in Fig. 1, and whose positions are shown by dotted lines in Fig. 2. In Fig. 2 some of the tiles It are absent, showing the top of bar 0.

V is the entrance to the convegting-chamber W. Y Y are the fire-doors.

I am aware that in the manufacture of iron adjustable and revolvingpans, stirrers, and

overhanging bridge-walls have been used.-

Such devices I do not claim broadly, because as constructed they are not adapted to the art of manufacturing red lead. I could not as ICO C and wall D d, the sides of the pan and the bar 0, of the semi-cylindrical covering-tiles R, well being so constructed relatively to each vertical flue R, and induction air-tube S, as other as to form an annular air-passage, d, of and for the purposes set forth. the adjustable spider E, for regulating the flow NORRIS B. GREGG. 5 of air through the passage (1, and the sup- Witnesses:

porting-wheels M, substantially as set forth. SAML. KNIGHT,

2. They combination, with the fixed stirrerl R. D. THORNBURGH. 

